Block with main table and "item" table

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I have a block which needs multiple items added to one instance. So i have created a list of items like:
<input name="items[]"></input>

Now i can use
public function save($args) {...}
in my controller to handle a save but i cant save my items array according to the right block ID because i have to firstly create the items and only then call
parent::save($args);
function, and only when that function is run i have an bID. So how to manage this?